Salmon isn’t hard, it’s just unforgiving in one direction. Two minutes early is fine. Two minutes late is chalky. Below are the questions I actually get asked about this dish, answered in the order they tend to come up when someone is standing in front of an open oven.
Prep: 10 mins Cook: 12–15 mins Serves: 4
What Temperature, and How Long for My Fillet’s Thickness?
200°C/400°F, uncovered, in a dish only slightly larger than the fish. Time depends entirely on thickness at the thickest point, not on weight and not on how many fillets are in the dish.
- 2 cm / 3/4 inch (tail-end pieces): 9 to 11 minutes
- 2.5 cm / 1 inch (standard supermarket fillet): 12 to 14 minutes
- 3.5 cm / 1.4 inch (centre-cut, thick): 15 to 18 minutes
If your four fillets are wildly different thicknesses, and mine usually are because the fishmonger cuts across a whole side, tuck the thin tail ends under themselves to double the depth. Otherwise the tails are done at nine minutes and the centre pieces at fifteen, and you have to choose which two people get dry fish.
Skin On or Skin Off?
On, skin-side down, every time. The skin is a layer of insulation between the hot dish and the delicate flesh above it, and it holds the fillet together when you lift it with a spatula. Skinless fillets baked directly on a dish tend to overcook on the underside and split when you serve them.
Oven-baked salmon skin doesn’t get crisp, though. That needs a hot pan or a grill. Baked, it goes soft and slightly rubbery, and it slides off the cooked fillet with almost no effort if you don’t want to eat it. I peel mine off. My husband eats his.
Ingredients
- 4 salmon fillets, about 6 ounces each, skin-on
- 3 tablespoons unsalted butter, melted
- 3 cloves garlic, minced
- 1 lemon, thinly sliced, plus wedges for serving
- 2 tablespoons fresh lemon juice
- 1 tablespoon olive oil, for the baking dish
- 1 teaspoon dried oregano or Italian seasoning
- 1/2 teaspoon paprika, for colour
- Salt and freshly ground black pepper, to taste
- 2 tablespoons fresh parsley, chopped
- Fresh dill or thyme sprigs, optional
Instructions
- Heat the oven to 200°C/400°F and oil a baking dish that fits the fillets with about 2 cm between them.
- Pat the fillets thoroughly dry with paper towel and season both sides with salt and pepper. Let them sit out for 10 minutes.
- Whisk the melted butter with the garlic, lemon juice, oregano and paprika.
- Lay the fillets skin-side down in the dish and spoon the garlic-lemon butter over each one.
- Top with the lemon slices, overlapping a couple per fillet.
- Bake 12 to 15 minutes for 2.5 cm fillets, using the thickness guide above for anything thicker or thinner.
- Start checking early. Pull the salmon at 52–55°C/125–130°F at the thickest point for medium, which is where this fish is at its best.
- Rest 3 minutes. Carryover will take it up another 2 to 3°C.
- Scatter parsley and dill over, spoon the pan butter back on top, and serve with lemon wedges.
How Do I Know It’s Done Without Cutting Into It?
An instant-read thermometer into the thickest part, angled in from the side. 52–55°C/125–130°F gives you medium: moist, just barely translucent at the very centre, flakes into large sheets rather than crumbs.
The earlier version of this recipe said to bake to 63°C/145°F. That’s the USDA’s food-safety recommendation for fish and it’s worth stating plainly, but it also produces the firm, dry salmon most people assume they simply don’t like. Anyone pregnant, immunocompromised, or feeding young children should stick with 63°C. Everyone else can decide for themselves, and most restaurants land nearer 52°C. This is a cooking note, not medical advice.
Without a thermometer: press the top of the fillet with a fingertip. Raw resists and springs back. Done gives slightly and the flakes begin to separate along the white fat lines. Overdone feels firm and dry through, and by then it’s too late.
Why Is There White Stuff Coming Out of My Salmon?
That’s albumin, a water-soluble protein that lives in the muscle. As the fish heats, the muscle fibres contract and squeeze liquid protein to the surface, where it sets white. It’s harmless and flavourless. It’s also a signal: a lot of albumin means the fish got hot fast, or got hotter than it needed to.
Three things reduce it. Bake at a lower temperature, 160°C/325°F, which takes 20 to 25 minutes for a 2.5 cm fillet and produces almost none. Brine the fillets for 10 minutes in a solution of 1 tablespoon salt per cup of cold water, then pat dry, which is the trick I use when I’m cooking for people. Or just stop earlier: pull at 52°C and you’ll see a fraction of what you see at 63°C.
Foil-Wrapped or Open in the Dish?
Open. Foil packets steam the fish, and while that’s forgiving, you get no colour, no concentration of the butter into a sauce, and a slightly flat flavour. The lemon slices go pale and limp instead of catching a bit of brown at the edges.
The one case for foil is a very lean wild fillet you’re worried about drying, or cooking on a barbecue where the heat is uneven. Add 2 to 3 minutes for the packet, because the fish has to heat the trapped air first.
What I do instead, when I want a glossier top, is switch to the grill setting for the final 90 seconds. Stand there and watch it. Lemon slices go from golden to black quickly.
Does Farmed Salmon Cook Differently From Wild?
Yes, and the difference is worth adjusting for. Farmed Atlantic salmon carries considerably more fat, which buffers heat and buys you a minute or two of margin. It’s also usually cut thicker, so it often needs slightly longer despite being more forgiving.
Wild sockeye and coho are lean, deep red, and thin, often 2 cm or less. They go from perfect to dry in about 90 seconds. Pull wild salmon at 49–52°C/120–125°F and drop the bake to 10 to 12 minutes. The extra butter in this recipe matters more with wild fish, not less. Lean white fish plays by different rules, and baked cod with a crumb crust that stays put depends on salting early rather than on fat.
Can I Bake It Straight From Frozen?
You can, and it works better than it has any right to. Rinse the ice glaze off under cold water, pat the fillet as dry as you can manage, and bake at 200°C/400°F for 20 to 25 minutes for a 2.5 cm fillet.
The one adjustment: hold the butter, garlic and lemon back for the first 10 minutes. Frozen fish weeps a lot of water early, and anything you put on top just floats away in it. Pour off the liquid at the 10-minute mark, then add the topping and finish. Same 52–55°C target.
Whatever you serve alongside, keep it acidic or starchy rather than rich, since the butter is already doing that job. A mushroom and spinach risotto works if you skip extra cheese, and a sharp Caesar salad is what I make most often. Cold leftovers flaked over greens the next day are genuinely good, which is not true of most reheated fish. If you’d rather cook salmon in a pan than an oven, creamy Tuscan salmon is the stovetop route, and fish and chips is where to go when nobody wants anything healthy at all.